Which of the following is not an example of a molecular formula?

{L i}_{2} F_{2}

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N a C l

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C_{2} H_{4}

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{F e}_{2} O_{3}

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Solution

The correct option is A ${L i}_{2} F_{2}$
Lithium Flouride always exist as a monomer with formula $L i F$ . So, $L i_{2} F_{2}$ is not a molecular formula. While $N a C l,$ $C_{2} H_{2},$ $F e_{2} O_{3}$ are examples of molecular formula.

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